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Finding the Fourth Proportional to 408.66, 563.76 and 261.26

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Solution

The fourth proportional to 408.66, 563.76 and 261.26 is: 360.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.66 : 563.76 = 261.26 : x
  2. Step 2: Convert to fraction form
    408.66/563.76 = 261.26/x
  3. Step 3: Cross multiply
    408.66x = 563.76 × 261.26
  4. Step 4: Simplify right side
    408.66x = 147,285.12
  5. Step 5: Solve for x
    x = 147,285.12/408.66
  6. Step 6: Final answer
    x = 360.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.